PROTEGO® Valves

Valve Technology

Closed vessels or tanks filled with liquids must have an opening through which the accumulated pressure can be released and vacuum in the tank or vessel compensated. For that purpose PROTEGO® Overpressure and Vacuum Relief Valves are provided with weight-loaded or spring-loaded valve discs. In the case of overpressure in the tank, the overpressure valve disc guided in the housing is lifted and releases the volume flow into the atmosphere. When there is a vacuum in the tank, the overpressure of the atmosphere lifts the vacuum disc and the tank is vented.

Opening characteristics of valves with different overpressure levels

Discharge with full-lift pallet

Closed

Discharge with full-lift

Vapor Savings

Vapor saving potential for 10% full lift type valve compared with 100% overpressure valve. Using a full lift type technology valve (valve requiring only 10% overpressure to reach full lift and provide full performance) can result in additional 44%:

PROTEGO® Diaphragm Valves

PROTEGO® Diaphragm Valves are used at weather-related low temperatures and in sticky, polymerizing media because of their flexible diaphragms. They are the only valves worldwide which are frost-proof down to temperatures of -40°C.

Benefits of PROTEGO® Diaphragm Valves

set pressure close to opening pressure enables optimum pressure maintenance in the system

liquid column height is monitored by level indicators (see picture on the right)

freeze protection at sub-zero conditions (see picture 1 on the back)

hinged design – maintenance friendly (see picture 2 on the back)

self draining function for condensate

particularly suitable for problematic products such as monomers,polymerizing media and vapours with a tendency to condensate, etc.

Operation - Inbreathing

Operation - Outbreathing

Diaphragm Valve PROTEGO® UB/SF

PROTEGO® Pilot Operated Relief Valves

PROTEGO® Pilot Operated Relief Valves discharge the volume flow without requiring pressure increase. Pilot valves are generally used wherever the valve must be very tightly sealed up to the set pressure. The pilot valves are produced according to API 2000 and have an optimized volume flow.

Emergency Pressure Relief Valve

PROTEGO® Leak Rates

The maximum permissible leak rates for PROTEGO® valves are listed in the table. We differentiate between the standard leak rate A and the special leak rates B and C. The latter require a valve pallet in metal-to-metal contact. The special leak rate C can be applied to valves having a minimum set pressure of 50 mbar or a set vacuum of 14 mbar. The standard leak rate A and the special leak rate B apply by analogy to below-atmospheric pressure uses. Liquid-loaded diaphragm valves are principally tested using the special leak rate B.